the centripetal force is given by F = m v² / r, the mass(m), velocity (v) and radius(r) of the circular path of an object are 0.5 kg, 10m s^-1 and 0.4 m respectively if m, v and r are measured to accuracies of 0.005 kg, 0.01 m s^-1 and 0.01 m respectively, find percentage error in force acting on the body.